#include<stdio.h>
int main()
{
	char grade;
	scanf_s("%c", &grade);
	printf("your score:");
	switch (grade)
	{
	case 'A':printf("85-100\n"); break;
	case 'B':printf("70-84\n"); break;
	case 'C':printf("60-69\n"); break;
	case 'D':printf("<60\n"); break;
	default:printf("enter date error!\n");
	}
	return 0;
}